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ＹＷＫⅡ蛋白质是本实验室发现的一种具有单一跨膜结构的精子膜蛋白，由胞外区、疏水的穿膜区和胞内区组成。其ｃＤＮＡ序列全长３６５７ｂｐ，命名为ＨＳＤ２，开放阅读框（ＯＲＦ）长２２８９ｂｐ，编码７６３个氨基酸。实验证明，胞外区部分结构具有较强的抗生育作用，
YWK Ⅱ protein is a sperm membrane protein with a single transmembrane structure found in this laboratory. It consists of extracellular domain, hydrophobic transmembrane domain and intracellular domain. The full length of its cDNA sequence 3657bp, named HSD 2, open reading frame (ORF) length 2289bp, encoding 763 amino acids. Experiments show that part of the extracellular structure has a strong anti-fertility effects,